Βιβλιογραφική Τεκμηρίωση:
CDC.gov Immunizations: The Basics, Definition of Terms
Herd Immunity. Smith DR.Vet Clin North Am Food Anim Pract. 2019 Nov;35(3):593-604.
Trained Immunity and Autoimmune Disease: Did Eve Sin before Adam? Berthelot JM, Sibilia J.Joint Bone Spine. 2019 May;86(3):293-295.